pip prod(deps): bump pyright from 1.1.390 to 1.1.391 in /eng (#2980)

Bumps [pyright](https://github.com/RobertCraigie/pyright-python) from 1.1.390 to 1.1.391.
- [Release notes](https://github.com/RobertCraigie/pyright-python/releases)
- [Commits](RobertCraigie/pyright-python@v1.1.390...v1.1.391)

---
updated-dependencies:
- dependency-name: pyright
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

eng/requirements.txt

@@ -1,5 +1,5 @@
 # This is for CI requirements or dev only
-pyright==1.1.390
+pyright==1.1.391
 pylint==3.2.7
 tox==4.23.2
 mypy==1.10.1